Journal
CATALYSIS TODAY
Volume 117, Issue 1-3, Pages 84-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2006.05.041
Keywords
gold; titania; mechanism; propene; epoxidation
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A reaction scheme is presented for the epoxidation of propene over gold-titania catalysts based on information from catalytic experiments and a detailed infrared study. The reaction mechanism involves the formation of a bidentate propoxy species on titania sites by means of a reactive adsorption of propene, which is catalyzed by the gold nanoparticles. The bidentate propoxy species can react with a peroxide species, produced on the gold from hydrogen and oxygen, to produce propene oxide. Catalyst deactivation occurs via a consecutive oxidation of the bidentate propoxy intermediate to strongly adsorbed carboxylate species. A kinetic model including these reaction steps was fitted to a series of catalytic experiments and provided a good description of the measurements and yielded realistic kinetic parameters. (C) 2006 Elsevier B.V. All rights reserved.
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